* The fedora —
* The leather jacket — a hybrid of the "Type 440" and the A-2 jacket,
* The bag — a modified Mark VII British gas mask bag
* The whip — a 10-foot bullwhip which Indy is really good at using
* The pistol — usually a World War I-era revolver or a .45 ACP Smith & Wesson Hand Ejector 2nd model revolver or M1917 revolver, and a 9mm Browning Hi-Power.
* The shoes - "Indy Boots" made by Alden Shoes, which are still sold today
Add in some stubble, some rugged good looks and there you have it!